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本文實例講述了asp.net C#實現解壓縮文件的方法。一共給大家介紹了三段代碼，一個是簡單的解壓縮單個zip文件，后一個可以解壓批量的大量的但需要調用ICSharpCode.SharpZipLib.dll類了，最后一個比較實例可壓縮也可以解壓縮了分享給大家供大家參考。具體如下：

解壓縮單個文件：

代碼如下:

using System.IO;

using System.IO.Compression;

string sourceFile=@"D:2.zip";

string destinationFile=@"D:1.txt";

private const long BUFFER_SIZE = 20480;

// make sure the source file is there

if (File.Exists ( sourceFile ))

{

FileStream sourceStream = null;

FileStream destinationStream = null;

GZipStream decompressedStream = null;

byte[] quartetBuffer = null;

try

{

// Read in the compressed source stream

sourceStream = new FileStream ( sourceFile, FileMode.Open );

// Create a compression stream pointing to the destiantion stream

decompressedStream = new DeflateStream ( sourceStream, CompressionMode.Decompress, true );

// Read the footer to determine the length of the destiantion file

quartetBuffer = new byte[4];

int position = (int)sourceStream.Length - 4;

sourceStream.Position = position;

sourceStream.Read ( quartetBuffer, 0, 4 );

sourceStream.Position = 0;

int checkLength = BitConverter.ToInt32 ( quartetBuffer, 0 );

byte[] buffer = new byte[checkLength + 100];

int offset = 0;

int total = 0;

// Read the compressed data into the buffer

while ( true )

{

int bytesRead = decompressedStream.Read ( buffer, offset, 100 );

if ( bytesRead == 0 )

break;

offset += bytesRead;

total += bytesRead;

}

// Now write everything to the destination file

destinationStream = new FileStream ( destinationFile, FileMode.Create );

destinationStream.Write ( buffer, 0, total );

// and flush everyhting to clean out the buffer

destinationStream.Flush ( );

}

catch ( ApplicationException ex )

{

Console.WriteLine(ex.Message, "解壓文件時發生錯誤：");

}

finally

{

// Make sure we allways close all streams

if ( sourceStream != null )

sourceStream.Close ( );

if ( decompressedStream != null )

decompressedStream.Close ( );

if ( destinationStream != null )

destinationStream.Close ( );

}

}

批量解壓縮(這需要調用一個解壓縮類庫。。 ICSharpCode.SharpZipLib.dll)

代碼如下:

using System;

using System.IO;

using System.Collections.Generic;

using System.Text;

using ICSharpCode.SharpZipLib.Zip;

namespace ZipLib

{

/// <summary>

/// 解壓縮類

/// </summary>

public static class ZIP

{

/// <summary>

/// 解壓ZIP文件包

/// </summary>

/// <param name="strZipFile">ZIP文件路徑</param>

/// <param name="strDir">解壓后的文件目錄路徑</param>

/// <returns>是否解壓成功</returns>

public static bool unzipFiles(string strZipFile, string strDir)

{

//判斷ZIP文件是否存在

if (File.Exists(strZipFile))

{

//判斷目錄是否存在

bool bUnzipDir = false;

//判斷是否需要創建目錄

if (!Directory.Exists(strDir))

bUnzipDir = (Directory.CreateDirectory(strDir) != null);

else

bUnzipDir = true;

//如果解壓目錄存在

if (bUnzipDir)

{

//獲得ZIP數據流

ZipInputStream zipStream = new ZipInputStream(File.OpenRead(strZipFile));

if (zipStream != null)

{

ZipEntry zipEntry = null;

while ((zipEntry = zipStream.GetNextEntry()) != null)

{

string strUnzipFile = strDir + "http://" + zipEntry.Name;

string strFileName = Path.GetFileName(strUnzipFile);

string strDirName = Path.GetDirectoryName(strUnzipFile);

//是否為解壓目錄

if (!string.IsNullOrEmpty(strDirName))

Directory.CreateDirectory(strDirName);

//是否為解壓文件

if (!string.IsNullOrEmpty(strFileName))

{

//解壓文件

FileStream unzipFileStream = new FileStream(strUnzipFile, FileMode.Create);

if (unzipFileStream != null)

{

byte[] buf = new byte[2048];

int size = 0;

while ((size = zipStream.Read(buf, 0, 2048)) > 0)

unzipFileStream.Write(buf, 0, size);

//關閉Stream

unzipFileStream.Flush();

unzipFileStream.Close();

}

}

}

//關閉ZIP流

zipStream.Close();

//返回值

return true;

}

}

}

return false;

}

}

}

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